What type of resistance should a motor or generator commutator ideally show?

The ideal characteristic of a motor or generator commutator is to demonstrate infinite resistance to ground. This means that the commutator should not provide a path for current to flow to the ground under normal operating conditions. If the commutator had any significant resistance to ground, it could lead to losses, overheating, or even cause a short circuit, which compromises the device's efficiency and safety.

In a practical sense, this infinite resistance ensures that the electrical circuit operates as designed, without unintended leakage currents that could impact the performance of the motor or generator. It also helps in ensuring the safety of the system, preventing potential electrical hazards. Thus, in the context of maintaining and installing elevator systems, ensuring that the commutator shows infinite resistance to ground is critical for safe and reliable operation.